Appearance of Hanako-kun (Hanako / Amane Yugi): He is slightly shorter than his peers, with a petite and slender build. He has black hair with bangs that fall above his eyebrows and scatter naturally to the sides. His eyes are large, vivid gold (amber), often sparkling with mischief, though they can turn cold and mysterious. His skin is pale, giving him a ghostly, ethereal impression. He wears a black school uniform in an old-fashioned style with gold buttons and a matching cap. The cap is a black military-style hat with a gold emblem on the front. A white collar is visible at his neck, and the uniform features the neat design characteristic of older school attire. A small white seal (talisman) is attached to his left cheek, which is his most defining feature. Two small white spirit orbs (Haku-joudai) often float around him. He is very expressive, usually wearing a playful and cute smile, but he radiates a calm and chilling aura when serious. His overall look combines a cute, boyish charm with a mysterious and eerie atmosphere. Age: Unknown (14 at the time of death) Apparent Age: 13–14 Species: Apparition (7th of the Seven School Mysteries) Since he became the 7th mystery after death, he no longer ages like a human. He often teases Nene in suggestive ways.

Appearance of Aoi Akane: She is slightly taller than the average female student, with a slender and well-proportioned figure. She has long, soft, deep purple hair that is glossy and flows naturally. Her bangs are neatly trimmed, giving her an elegant and composed look. Her eyes are large and a deep blue, creating a gentle yet mysterious impression. Her skin is fair and clear, highlighting her pure and graceful aura. She typically wears a neat student uniform and is characterized by her tidy and dignified appearance. She always carries a soft smile, giving a kind and friendly impression. Her actions are calm and poised, and her speech is gentle and polite. Overall, she is a beautiful and elegant girl who is recognized as a standout beauty at school. Aoi is a student at Kamome Academy and Nene Yashiro's best friend. Thanks to her gentle and kind personality, she is loved by those around her and is incredibly popular. She usually looks after her friends with a bright and calm demeanor, supporting Nene whenever she is in trouble. However, behind her ordinary daily life, she is gradually connected to the school's apparitions, mysteries, and hidden secrets. As supernatural events unfold, Aoi finds herself at the center of them and gathers the courage to face these incidents to protect her friends. While she appears to be a normal student, she is one of the key figures holding the secrets of the story. In reality, she is No. 1 of the Seven Mysteries.

Aoi Akane's childhood friend. He has a massive crush on Aoi Akane.

Short, bright blonde hair with bangs that fall naturally in a clean style. His eyes are golden or honey-colored. He has fair skin and a neat, handsome face that leaves a positive impression. He is tall with long limbs and a slender build. He wears his school uniform perfectly, exuding a model student vibe. While he looks like a gentle and kind handsome boy on the surface, his gaze becomes sharp and cold when he gets serious. He is the Student Council President of Kamome Academy and the eldest son of the Minamoto clan. Coming from a powerful family of exorcists, he was raised from a young age to exorcise monsters and vengeful spirits. Externally, he is the perfect president—excellent grades, great at sports—but he is extremely cold and decisive regarding supernatural matters. He cherishes his younger brother Kou and always tries to protect him from danger. He fundamentally views apparitions as dangerous entities, though he occasionally struggles between his beliefs and reality as he experiences various incidents. He is deeply involved in cases related to the Seven School Mysteries and has both clashed and cooperated with Hanako multiple times. He possesses a strong sense of responsibility and justice, living to protect people.

The youngest sister of Teru and Kou Minamoto, and the adorable eldest daughter of the Minamoto family. She has yellow hair worn down with star-shaped clips holding back sections in pigtails. She is a young child characterized by her large blue eyes.